You are very welcome.
It was a good idea to check with local cooperative extension agents and nearby university ag departments. Google search for them or I have a link in my signature block: "Coop Extension Finder ". If you find a nearby nursery or garden shop that invites Master Gardeners to come in and answer questions, they probably care about good advice and repeat customers.
I don't have any experience with online companies delivering seedlings at the best times for towns everywhere in the country. I would rather trust a local store if you can find one with a knowledgeable manager who cares about his or her reputation.
I'm guessing that eggplant should be set out AFTER tomatoes. Maybe around the same time as peppers? Or even later?
P.S. It will matter probably a lot how close to the water you live and which way the local wind patterns flow.
If you look at the ATP Members Map, there are three ATP members who live near Providence. They might share their planting dates for lettuce and eggplant.
http://garden.org/users/member...
Would any of you have planting dates you would reccomend for the Providence area, for eggplant and lettuce?
@susansconi
@BobsterRI
@belaschick
Of course, there are lettuce varieties for early spring only (like May Queen), middle and later spring, early or late fall, and even lettuce varieties that do well in summer (Batavian) or mild winters.
You can look up the seeds you have here, or pick some varieties and then shop for those:
http://garden.org/plants/brows...
http://garden.org/plants/group...
Too bad we didn't ask for a multiple-choice field in the Lettuce database like "suitable for these seasons". That's pretty subjective and varies regionally, but it would be a starting point for searches.
As a rule of thumb, if you want the lettuce to stay sweet and not bolt as spring turns warmer, look for "resists bolting" in the description.